Size Effects in the Magnetization of Epitaxial YBa2Cu3Ox Films
Systematic measurements of magnetization dependence on sample size have been performed on epitaxial YBCO films in order to investigate granularity characteristics of oxide superconductor thin films. YBCO films were deposited by using a molecular beam epitaxy(MBE) technique and chemically etched into a disks of diameters between 10μm to 1 mm. Magnetization of these films have exhibited a remarkable linear dependence of the magnetization on the diameter, which shows Bean-critical-state model has been fully established and no granularity has existed in these epitaxial YBCO films. Results have been compared with YBCO films deposited by chemical vapor deposition(CVD) technique.
KeywordsMolecular Beam Epitaxy Remanent Magnetization Critical Current Density YBCO Film Oxide Superconductor
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